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Avoid list copy when unnecessary

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This commit is contained in:
themode 2022-03-25 08:18:30 +01:00
parent 2d6368f6bd
commit 9ee74845e1
2 changed files with 42 additions and 2 deletions
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9
src/main/java/net/minestom/server/tag/Tag.java
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@ -129,10 +129,15 @@ public class Tag<T> {
}, null, path, }, null, path,
copy != null ? ts -> { copy != null ? ts -> {
T[] array = (T[]) new Object[ts.size()]; T[] array = (T[]) new Object[ts.size()];
boolean shallowCopy = true;
for (int i = 0; i < ts.size(); i++) { for (int i = 0; i < ts.size(); i++) {
array[i] = copy.apply(ts.get(i)); T t = ts.get(i);
array[i] = copy.apply(t);
if (shallowCopy && array[i] != t) {
shallowCopy = false;
}
} }
return List.of(array); return shallowCopy ? List.copyOf(ts) : List.of(array);
} : List::copyOf); } : List::copyOf);
} }

35
src/test/java/net/minestom/server/tag/TagListTest.java
View File

@ -26,6 +26,41 @@ public class TagListTest {
assertNull(handler.getTag(tag)); assertNull(handler.getTag(tag));
} }
@Test
public void cache() {
var handler = TagHandler.newHandler();
var tag = Tag.Integer("number").list();
var val = List.of(1, 2, 3);
handler.setTag(tag, val);
assertSame(val, handler.getTag(tag));
}
@Test
public void recursiveCache() {
var handler = TagHandler.newHandler();
var tag = Tag.Integer("number").list().list();
var val = List.of(List.of(1, 2, 3), List.of(4, 5, 6));
handler.setTag(tag, val);
assertSame(val.get(0), handler.getTag(tag).get(0));
assertSame(val.get(1), handler.getTag(tag).get(1));
assertSame(val, handler.getTag(tag));
}
@Test
public void recursiveCacheIncorrect() {
var handler = TagHandler.newHandler();
var tag = Tag.Integer("number").list().list();
var val = List.of(List.of(1, 2, 3), new ArrayList<>(Arrays.asList(4, 5, 6)));
handler.setTag(tag, val);
assertSame(val.get(0), handler.getTag(tag).get(0));
assertNotSame(val.get(1), handler.getTag(tag).get(1));
assertNotSame(val, handler.getTag(tag));
assertEquals(val, handler.getTag(tag));
}
@Test @Test
public void snbt() { public void snbt() {
var handler = TagHandler.newHandler(); var handler = TagHandler.newHandler();